Data courtesy of the Grand Comics Database under Creative Commons license.

Issue Details

Issue	#21
Published	June 1980
Cover Price	0.75 USD
Pages	52
Editing	Dennis O'Neil; Mark Gruenwald (assistant editor); Jim Shooter (editor-in-chief)
Notes	Follows up on on What If? #1 (February 1977). Cover credits 2005 by Steven Tice.

Cover Details - "What If Invisible Girl of the Fantastic Four Married the Sub-Mariner"

Characters	the Fantastic Four [the Human Torch [Johnny Storm]; the Invisible Girl; Mr. Fantastic]; the Sub-Mariner
Genre	superhero
Pencils	Gene Colan
Inks	Al Milgrom?
Letters	Irving Watanabe
Notes	Follows up on on What If? #1 (February 1977). Cover credits 2005 by Steven Tice.

16 page The Fantastic Four story "Decline and Fall!; (What If... Sub-Mariner Had Married the Invisible Girl? chapter 1)"

Characters	Atlanteans; the Awesome Android (flashback); Dorma; Dr. Doom (flashback); the Fantastic Four [the Human Torch [Johnny Storm]; Mr. Fantastic; Spider-Man; the Thing]; the Invisible Girl; Krang; the Mad Thinker (flashback); the Red Ghost (flashback); the Sub-Mariner; the Super-Skrull; the Watcher
Genre	superhero
Script	Bill Mantlo
Pencils	Gene Colan
Inks	Bob Wiacek
Colors	Carl Gafford [as Gaff]
Letters	Tom Orzechowski
Reprinted	in Star Magazine (Edizioni Star Comics, 1990 series) #7 (March 1991) [Italy]

1 page Spider-Man; Hostess Twinkies advertisement "The Trap"

Characters	Larcenous Lil; Spider-Man
Genre	superhero
Pencils	Sal Buscema
Inks	Mike Esposito?
Letters	Irving Watanabe
Notes	Comics ad for Hostess Twinkies from Continental Baking Company.

Half page promo (ad from the publisher) "What's Wrong With This Picture?"

Genre	humor
Pencils	Ron Zalme (signed)
Inks	Ron Zalme (signed)
Notes	Comics promo for the Marvel Comics subscription service.

6 page The Fantastic Four story "Two Against Atlantis!; (What If... Sub-Mariner Had Married the Invisible Girl? chapter 2)"

Characters	Atlanteans; Dorma; the Fantastic Four [the Human Torch [Johnny Storm]; Mr. Fantastic]; Krang; the Sub-Mariner; Susan Storm
Genre	superhero
Script	Bill Mantlo
Pencils	Gene Colan
Inks	Bob Wiacek
Colors	Carl Gafford
Letters	Tom Orzechowski
Reprinted	in Star Magazine (Edizioni Star Comics, 1990 series) #7 (March 1991) [Italy]

12 page The Fantastic Four story "Harvest of Shame!; (What If... Sub-Mariner Had Married the Invisible Girl? chapter 3)"

Characters	Atlanteans; Dorma; the Fantastic Four [the Human Torch [Johnny Storm]; Mr. Fantastic]; Krang; the Sub-Mariner; Susan Storm; Susan Storm and the Sub-Mariner's newborn son; the Watcher
Genre	superhero
Script	Bill Mantlo
Pencils	Gene Colan
Inks	Bob Wiacek
Colors	Carl Gafford
Letters	Tom Orzechowski
Reprinted	in Star Magazine (Edizioni Star Comics, 1990 series) #7 (March 1991) [Italy]

2 page letters page "Why Not?; The Watcher Knows..."

Script	various; Mark Gruenwald
Letters	typeset
Notes	Letters on What If? #18, suggestions for future story titles and article with answers from the Watcher.

1 page O.J. Simpson; Dingo advertisement "The Dingo Kids Meet O.J. Simpson"

Characters	the Dingo Kids; O.J. Simpson
Genre	celebrity; sports
Notes	Inside back cover. Comics ad for Dingo boots from Northwest Industries Inc..